Can someone check these?

11. The sales tax rate is 7.4%?

a. Find the tax paid for a pair of shoes with a list price of $93

b. the team made a total of 325 goals. what percent of the teams made goals did richard make?
$6.88; $99.88
$6.88; $93.68
$0.69; $99.88
$0.69; $93.68

12. Doug is a salesperson in a retail store and ears $75 per week, plus 15% of his weekly sales, if Doug makes $550 one week. What are his sales for that week?
$3,200
$627
$566
$1,914

13. Last year, a poll of 1,00 voters conducted by the staff of Senator Chun found 522 people approved of the job the senator was doing. This year, anew poll of 1,000 voters shows that 423 approve of the senators performance. Find the percent of change in the of voter who approve of the senators performance.
19% increase
23.4% decrease
23.4% increase
19% decrease

14. The owner of an electronics store received a shipment of MP3 players at a cost of $64.25 each. If he sells the MP3 players for $99.99 each, what is the percent markup? Round to the nearest whole percent?
6%
36%
56%
62%

My answers:
B
C
A
C

Number 13 is wrong it's D because it decreased

This site will teach you about percents.

http://www.mathsisfun.com/percentage-menu.html

You will find more instructions in that site.

You may also want to use
http://www.khanacademy.org/math

Tbh I just guessed cause I have no clue how to get the answer?! :(

Idk these are just practice problems but idk how to do them. and what is text materials?!

Text materials can be your book or assigned online reading.

Try this site for an explanation of percents.

for question 12:- 550-75=15% of x, x=(550-75)100/15 which is approximately $3200

Ok I don't see a site and will that help me with ALL of the problems?!

Omg thank you SSSOOO much David Soye. :D

Do u think u could help me with the others?!

Ok thanks so much Mrs. Sue! :D